What will happen to the cryptocurrencies we have today when governments start to issue there own cryptocurrency?

The Fed is already prepping a Jekyll Island 2.0 based on blockchain. Hive account@storyteller7 When that is ready expect a fiat crypto.

Even if the elites choose not to end financial folly & continue to make currencies fail you now have a choice in money. Goldmoney, the Uber or Airbnb of money, facilitates your own personal gold standard. You too can get your own Goldmoney account.